| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | how [pron] [verb] [conj] | 389 |
|
| 2 | [adv] [pron] happen [conj] | 97 |
|
| 3 | [Wh adv] [pron] happen [conj] | 15 |
|
| 4 | how [pron] happen [conj] | 7 |
|
